Realizing Bi-doped α-Cu2Se as a promising near-room- temperature thermoelectric material

Liao, Wang-Wei and Yang, Lei and Chen, Jie and Zhou, Da-Li and Qu, Xian-Lin and Zheng, Kun and Han, Guang and Zhou, Jia-Bei and Hong, Min ORCID: https://orcid.org/0000-0002-6469-9194 and Chen, Zhi-Gang ORCID: https://orcid.org/0000-0002-9309-7993 (2019) Realizing Bi-doped α-Cu2Se as a promising near-room- temperature thermoelectric material. Chemical Engineering Journal, 371. pp. 593-599. ISSN 1385-8947


Abstract

Copper selenide (Cu2Se) has been extensively studied as an eco-friendly thermoelectric candidate owing to the outstanding thermoelectric performance of its high-temperature β-phase. In this study, we propose that α-Cu2Se is also a promising thermoelectric material at near-room-temperature. We synthesize nanostructured Cu2-xSe via a facile solvothermal method, and densify the samples using Spark Plasma Sintering to maintain the small grain sizes. Although the as-prepared α-Cu2Se has intrinsically low lattice thermal conductivity, its high Cu deficiency leads to a high carrier concentration, therefore, a low thermoelectric performance. As an electron donor, bismuth can effectively compress the Cu vacancies of the as-prepared α-Cu2Se and in turn reduce its carrier concentration from 4.1 × 1020 to 2.0 × 1020 cm−3 at room temperature, achieving a significantly enhanced power factor and a reduced carrier thermal conductivity. Consequently, a zT of 0.43 at 373 K is obtained in Cu1.982Bi0.006Se, showing great potential in developing high-performance near-room-temperature α-Cu2Se-based thermoelectric materials.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Date Deposited: 14 Jun 2022 01:14
Last Modified: 14 Jun 2022 01:41
Uncontrolled Keywords: Copper selenide; Near-room-temperature; Thermoelectric; α-Phase
Fields of Research (2020): 40 ENGINEERING > 4016 Materials engineering > 401699 Materials engineering not elsewhere classified
Identification Number or DOI: https://doi.org/10.1016/j.cej.2019.04.081
URI: http://eprints.usq.edu.au/id/eprint/49048

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